Debye-Sears Effect (Ultrasonic Experiment Set 5)

Introduction to acousto-optics and the use of continuously emitted ultrasonic waves as well as visualization of a standing ultrasonic field using laser light

The devices and materials in this experiment set enable experiments to introduce acousto-optics and the use of continuously emitted ultrasonic waves (CW - continuous wave). The focus is on the Debye-Sears effect and the imaging of a standing ultrasonic wave field using laser light. Using the CW generator SC600, ultrasonic waves of different frequencies can be generated in a water bath. The ultrasonic waves behave like the elements of an optical grating, the grating constant of which depends on the wavelength of the ultrasound. When parallel laser light passes through it, it is diffracted. This creates a classic diffraction pattern, the Debye-Sears effect. By using different ultrasonic frequencies as well as red and green laser light, the dependence of the distance between the diffraction orders on the acoustic and optical wavelength can be shown. If divergent laser light is used, a direct optical projection of the acoustic wave field can be carried out. With the help of an absorber mat , the differences between progressive and standing ultrasonic waves can be demonstrated. By adding a photodiode receiver , the set can be expanded to an ultrasonic resonance cell. This is mainly used for concentration measurements.

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